1) Old releases of Apache MADlib are archived at
https://archive.apache.org/dist/. The incubator releases are archived
at https://archive.apache.org/dist/incubator/madlib/, and the TLP
releases are archived at
https://archive.apache.org/dist/madlib/. URLs in Apache MADlib's
web page must be changed to reflect these.

Previous site (madlib.net) contained all the documentation and
binary files. This commit moves all the documentation to the apache
repository and creates links to the older binaries. Those binaries
are stored in the older github project (github.com/madlib/madlib).